leetcode520. Detect Capital

class Solution {
public:
    bool detectCapitalUse(string word) {
        int n=word.size();
        int k=0;
        if(word[0]>='A'&&word[0]<='Z') k=1;
        int k2=0,k3=0;
        for(int i=1;i<n;i++){
            if(word[i]>='A'&&word[i]<='Z') k2=1;
            else k3=1;
        }
        if(k&&k2==0) return true;
        if(k&&k3==0) return true;
        if(k==0&&k2==0) return true;
        return false;
    }
};